CN105874784A - Digital data sending and receiving method and apparatus based on composite video signal - Google Patents
Digital data sending and receiving method and apparatus based on composite video signal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
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- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
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- H04N7/013—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter the incoming video signal comprising different parts having originally different frame rate, e.g. video and graphics
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Abstract
Disclosed are a digital data sending and receiving method and apparatus based on a composite video signal. The data sending apparatus comprises a mapping unit for mapping a digital code stream provided by a digital data source into video data for synthesizing a composite video signal; a composite video signal coding unit for receiving video data for synthesizing the composite video signal from the mapping unit and generating an analogue composite video signal according to a pre-determined composite video system requirement; and a composite video transmission interface for transferring the analogue composite video signal. In the present invention, the digital data is "disguised" as video data in a traditional composite video signal, such that the digital data including a high-definition digital video signal is directly transmitted by using a traditional composite video interface and a composite video transmission channel. Compared with the prior art, the present invention has advantages that the high-resolution video monitoring can be realized, the cost is low, the mounting is simple, the maintenance is convenient and the compatibility is strong.
Description
The present invention relates to electronic applications, more particularly to a kind of numerical data method of sending and receiving and device based on analog composite video signal, it can apply in video surveillance applications.
With demand more and more higher of the people to safety precaution, the video monitoring system unusual universal every field applied in social life.Video monitoring system generally comprises front end camera, transmission cable and video monitoring platform.DVR (Digital Video Recoder digital video recorder) or (Network Video Recorder network hard disk video recorder) of the camera by network cable or coaxial video cable by transmission of video images into video monitoring platform, vision signal is assigned into each monitor again for monitor supervision platform and video recording equipment is shown, the operation such as stores.
At this stage, the trend that Video Supervision Technique develops to high definition is more and more obvious.High definition is suggested first in field of broadcast televisions.Video technique field has SD, high definition and full HD definition for video, wherein, SD is video format of the video vertical resolution in below 720p, and wherein 720p progressively scans for 720 lines.High definition is video format of the video vertical resolution more than 720p or 1080i, wherein 1080i is 1080 line interlaces, full HD (Full HD) refers to that video vertical resolution is up to 1080p video format, and 1080p progressively scans for 1080 lines, and resolution ratio is 1920:1080.It should be noted that the implication of " high definition " refers to video vertical resolution in 720p and the video format of the above in the present invention, so that including traditional high definition and full HD implication and other possibility.High definition is not the thing that part is easily able to for video monitoring.It is related to a lot of link of monitoring system, particularly front end camera and transmission link.
Front end camera is divided into simulation camera (CCTV camera) and network digital camera (IP camera) as the harvester of head end video picture signal.Simulation camera is easy to use and installed.But in order to be more convenient for, people remotely can check or operate, and the technological trend of current monitoring camera has been digitlization and networking.
Fig. 1 show the simulation camera topological structure schematic diagram of the prior art based on DVR (Digital Video Recoder digital video recorders), and Fig. 2 show the topological structure schematic diagram of the IP Camera of the prior art based on NVR (Network Video Recorder network hard disk video recorders).
Wherein, monitor video signal can pass through IP (Internet Protocol) network transmission if by DVR or NVR receptions.Therefore see from this point on, DVR and NVR function are approximate.The difference of core is DVR/NVR and shooting between them
Where the mode and video data of head connection are compressed.
Usually, the topological structure that the simulation CCTV cameras shown in Fig. 1 are combined with DVR is more used, because it is easily installed relatively, it is only necessary to camera is patched in one end of cable, the other end patches DVR boxes.However, the solution of simulation CCTV cameras is limited to video resolution.CCTV cameras pass through coaxial cable transmitting video data, that transmitted on coaxial cable is the composite video signal CVBS under NTSC or pal mode, conventional resolution ratio is D1 (704*576), and nearest resolution ratio just expands to 960H (960*576).But the demand now for higher resolution (such as 1280*720 (720p), 1920*1080 (1080p) or higher) is but more and more urgent.In the prior art but not only without the video transmission standard of high-resolution analog video streaming can be supported, and also have a stern challenge for high resolution model video transmission standard, the i.e. existing usual quality of coaxial cable is common or even poor, in long-distance data transmission in the presence of serious decay, so if without repeater, it is difficult that long range (such as more than 300 meters) transmits high-resolution video data.
Therefore, in the case where needing high resolution video surveillance, IP Camera and NVR combination more preferably because being the IP network based on Ethernet between them as transmission medium.But, because being directly connected between IP Camera and NVR boxes by IP network, it needs network management, repeater, and the installation of the instant inserted and instant using type relative to DVR, its installation is more complicated.Moreover, safeguarding that stable operation (such as more than 1 year) is a huge challenge for the user without network to a unmanaged network in a long time.Therefore, although the market share of IP Camera+NVR video monitoring system was in rapid growth in recent years, many situations and customer requirement still use the monitoring scheme of DVR formulas.
Therefore, it is necessary to propose a solution with efficiently against problems of the prior art.
The content of the invention
In view of this, an object of the present invention is to provide a kind of numerical data method of sending and receiving, and it can transmit the various numerical datas including digital high-definition video data based on analog composite video signal.
The second object of the present invention is to provide a kind of numerical data sending and receiving device, and it can transmit the various numerical datas including digital high-definition video data based on analog composite video signal.
In order to achieve the above object, according to the first aspect of the invention, the present invention provides a kind of data sending device, and it includes：Map unit, the digital code stream for digital data source to be provided is mapped in the video data for synthesizing composite video signal；Composite video signal coding unit, receives the video data for synthesizing composite video signal from map unit, and require generation analog composite video signal according to predetermined composite video standard；Composite video coffret, for transmitting the analog composite video signal.
In one further embodiment, the map unit be every group of data in the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
In one further embodiment, the corresponding brightness data of each pixel or chroma data in horizontal scanning line for synthesizing composite video signal are X bit binary datas, the map unit be every group of common Y bit binary data in the digital code stream that digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel of every adjacent N number of pixel or the X bit binary datas of chroma data in high Y in, the map unit also by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X is more than or equal to 8, Y is more than or equal to 2.
According to another aspect of the present invention, the present invention provides a kind of camera device, and it includes：Video acquisition unit, the digital video source data for gathering captured picture；Video compressing unit, compression of digital video data are obtained for the digital video source data to be compressed；Map unit, for the compression of digital video data to be mapped in the video data for synthesizing composite video signal；Composite video signal coding unit, receives the video data for synthesizing composite video signal from map unit, and require generation analog composite video signal according to predetermined composite video standard；Composite video coffret, the analog composite video signal is transmitted for connecting coaxial cable, and by the coaxial cable.
In one further embodiment, the digital video source data of the video acquisition unit collection is high-definition format, the compression of digital video data that the video compressing unit is obtained are also high-definition digital video compressed data, the map unit be by every group of data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
In one further embodiment, the corresponding brightness data of each pixel or chroma data in horizontal scanning line for synthesizing composite video signal are X bit binary datas, the map unit be by every group of common Y bit binary data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel of every adjacent N number of pixel or the X bit binary datas of chroma data in high Y in, the map unit also by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X is more than or equal to 8, Y is more than or equal to 2, the high-definition digital video is compressed in the map unit
Data be mapped to for synthesize composite video signal horizontal scanning line in pixel corresponding brightness data when, the map unit is also generated for synthesizing the corresponding chroma data of the pixel in composite video signal, or, during the corresponding chroma data of pixel in the horizontal scanning line that the high-definition digital video compressed data is mapped to for synthesizing composite video signal by the map unit, the map unit is also generated for synthesizing the corresponding chroma data of the pixel in composite video signal, composite video signal coding unit is additionally operable to generate synchronizing signal, and according to predetermined composite video standard by synchronizing signal and chroma data and brightness data from map unit are compounded to form analog composite video signal.
According to another aspect of the present invention, the present invention provides a kind of data sink, and it includes：Composite video coffret, for receiving analog composite video signal；Composite video signal decoding unit is used to, according to predetermined composite video standard requirement, analog composite video signal be carried out decoding process to obtain video data；Data extracting unit, for extracting the digital code stream being mapped in video data from the video data.
In one further embodiment, composite video signal decoding unit is used to analog composite video signal is carried out into decoding process to obtain the corresponding brightness data of pixel and the chroma data in synchronizing signal, horizontal scanning line according to predetermined composite video standard requirement, and data extracting unit is that the digital code stream being mapped in brightness data or chroma data is extracted from the corresponding brightness data of pixel or chroma data in horizontal scanning line.
In one further embodiment, the data extracting unit is that one group of data of digital code stream are extracted from the corresponding brightness data of every adjacent N number of pixel or chroma data in horizontal scanning line, and wherein N is the integer more than or equal to 1.
According to another aspect of the present invention, the present invention provides a kind of video signal receiving apparatus, and it includes：Composite video coffret, for receiving analog composite video signal by coaxial cable；Composite video signal decoding unit is used to, according to predetermined composite video standard requirement, analog composite video signal be carried out decoding process to obtain video data；Data extracting unit, for extracting the digital code stream being mapped in video data from the video data；Video decompression unit, for being decompressed to the digital code stream, with the digital video signal after being decompressed.
In one further embodiment, composite video signal decoding unit is used to carry out decoding process to obtain the corresponding brightness data of pixel and the chroma data in synchronizing signal, horizontal scanning line by analog composite video signal according to predetermined composite video standard requirement, data extracting unit is that the digital code stream being mapped in video data is extracted from the corresponding brightness data of pixel or chroma data in horizontal scanning line, and the digital video signal is high-definition format.
In one further embodiment, the corresponding brightness data of each pixel or chroma data in the horizontal scanning line are X bit binary datas, and the data extracting unit is from the corresponding brightness number of every adjacent N number of pixel in the horizontal scanning line
According to or the X bit binary datas of chroma data in high Y in extract one group of common Y data of digital code stream, wherein X and Y are positive integer and Y is less than X, and the N is more than or equal to 4, X more than or equal to 8, Y more than or equal to 2.
According to another aspect of the present invention, the present invention provides a kind of data transmission method for uplink, and it includes：The digital code stream that digital data source is provided is mapped in the video data for synthesizing composite video signal；Analog composite video signal is produced based on the video data for synthesizing composite video signal according to predetermined composite video standard requirement；With the transmission analog composite video signal.
In one further embodiment, by the digital code stream that digital data source is provided be mapped to for synthesize composite video signal video data in be：Every group of data in the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
In one further embodiment, the corresponding brightness data of each pixel or chroma data in horizontal scanning line for synthesizing composite video signal be every group of data in X bit binary datas, the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in be：Every group of common Y bit binary data in the digital code stream that digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel of every adjacent N number of pixel or the X bit binary datas of chroma data in high Y in, by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X is more than or equal to 8, Y is more than or equal to 2.
According to another aspect of the present invention, the present invention provides a kind of data transmission method for uplink, and it includes：The digital video source data of the captured picture of collection；The digital video source data is compressed and compression of digital video data are obtained；The compression of digital video data are mapped in the video data for synthesizing composite video signal；Video data based on synthesis composite video signal requires to produce analog composite video signal according to predetermined composite video standard；The analog composite video signal is transmitted by coaxial cable.
In one further embodiment, the digital video source data of collection is high-definition format, the compression of digital video data of acquisition are also high-definition digital video compressed data, by the compression of digital video data be mapped to for synthesize composite video signal video data in be：By every group of data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
According to another aspect of the present invention, the present invention provides data receiver method, and it includes：Receive analog composite video signal；
Analog composite video signal is carried out decoding process to obtain video data according to predetermined composite video standard requirement；The digital code stream being mapped in the video data is extracted from the video data.
In one further embodiment, the video data includes the corresponding brightness data of pixel and chroma data in horizontal scanning line；The digital code stream being mapped in the video data is extracted from the video data is：One group of data of digital code stream are extracted from the corresponding brightness data of every adjacent N number of pixel or chroma data in horizontal scanning line, wherein N is the integer more than or equal to 1.
According to a further aspect of the invention, a kind of data receiver method of the invention, it includes：Analog composite video signal is received by coaxial cable；Analog composite video signal is carried out decoding process to obtain video data according to predetermined composite video standard requirement；The digital code stream being mapped in video data is extracted from the video data；The digital code stream is decompressed, with the digital video signal after being decompressed.
In one further embodiment, analog composite video signal is carried out to obtain the corresponding brightness data of pixel and the chroma data in synchronizing signal, horizontal scanning line by decoding process according to predetermined composite video standard requirement, the digital code stream being mapped in video data is extracted from the video data is：One group of data of the digital code stream being mapped in video data are extracted from the corresponding brightness data of pixel or chroma data in horizontal scanning line, the digital video signal is high-definition format.
Compared with prior art, the present invention is in data sending terminal, map digital data onto in brightness data or chroma data for synthesizing composite video signal, then according to existing composite video standard based on the brightness data or chroma data formation analog composite video signal for synthesizing composite video signal, so as to pass through existing coaxial cable remote transmission, and in data receiver, after being decoded according to existing composite video standard, target number data can be recovered from the brightness data or chroma data that decode, the numerical data can be the various numerical datas including digital high-definition video data.
Fig. 1 show the simulation camera topological structure schematic diagram of the prior art based on DVR；
Fig. 2 show the topological structure schematic diagram of the IP Camera of the prior art based on NVR；
Fig. 3 is a kind of functional-block diagram of preferred embodiment of data sending device of the present invention；
Fig. 4 is a kind of functional-block diagram of preferred embodiment of data sink of the present invention；
Fig. 5 is data transmission method for uplink of the present invention in a kind of method flow diagram of preferred embodiment；With
Fig. 6 is data receiver method of the present invention in a kind of method flow diagram of preferred embodiment.
Illustrate the embodiment of the present invention with reference to Figure of description.
The emphasis of the present invention, one of feature are：By the way that traditional composite video interface and composite video transmission channel directly numerical data of the transmission including high-definition digital video signal will be utilized so as to realize through numerical data " camouflage " into the video data in conventional composite vision signal.
With reference to Fig. 3, it is used as a kind of preferred embodiment, Fig. 3 provides a kind of data sending device 300, and for transmitting numerical data by composite video signal, it includes digital data source 310, map unit 320, composite video signal coding unit 330 and composite video coffret 340.
The digital data source 310 can provide digital code stream, and the digital code stream can include vision signal, can also include audio signal, still can include other kinds of data signal, such as control signal, monitoring alarm signal.In one embodiment, digital data transmission apparatus of the invention can support the digital code stream of any data type.
In a preferred embodiment, the digital data source 310 can include video acquisition unit and video compressing unit.The video acquisition unit is used for the digital video source data for gathering captured picture.The digital video source can be high-definition format, and the high-definition format refers to the resolution ratio of 720p and the above, such as 720p, 1080i, 1080p etc..H.263, MPEG2, the video compression standard such as H.265 the video compressing unit can use existing various compression standards, such as, and the digital video source data is compressed to obtain compression of digital video data.Now, the digital code stream that the digital data source 310 is provided just includes the compression of digital video data.
In another preferred embodiment, the digital data source 310 can also include audio collection unit and audio compressing unit, the audio collection unit gathers DAB source data, the audio compressing unit can be encoded to obtain encoded digital audio data to the DAB source data of collection, the digital code stream that now digital data source 310 is provided can not only include compression of digital video data, and encoded digital audio data can also be included simultaneously.It is used as a kind of known technology, luminance signal, carrier chrominance signal and field synchronization, line synchronising signal, row field blanking signal etc. are contained in a signal, referred to as composite video signal, also known as CVBS, represent Color, Video, Blanking, Sync, or composite video baseband signal.For simplicity, other signals such as the field synchronization in CVBS signals in addition to luminance signal, carrier chrominance signal, line synchronising signal, row field blanking signal are referred to as synchronizing signal in the present invention.Composite video signal is compounded in brightness, colourity and synchronizing signal in one signalling channel and transmitted, namely need before transmission carrier chrominance signal and luminance signal " synthesis " in a signal, carrier chrominance signal is come with luminance signal " separation " again after transport, display circuit processing is sent to.
The digital code stream that the map unit 320 is used to provide digital data source 310 is mapped to for synthesizing composite video signal
(CVBS) in brightness data or chroma data, the brightness data and chroma data may be collectively termed as video data.It is preferred that, the map unit 320 be every group of data in the digital code stream that the digital data source 310 is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel in, wherein N is the integer more than or equal to 1, the corresponding brightness data of each pixel or chroma data after mapping in adjacent N number of pixel are identicals, are all same group of data in the digital code stream that the digital data source 310 is provided.N value is bigger, and the reliability for recovering the data code flow being mapped in data receiver is higher, and N value can be set as needed, such as N is 6,7,8,9 etc..
In a specific embodiment, the corresponding brightness data of each pixel in horizontal scanning line for synthesizing composite video signal is X bit binary datas, the map unit 320 be every group of common Y bit binary data in the digital code stream that digital data source 310 is provided be mapped to for synthesize composite video signal horizontal scanning line in every adjacent N number of pixel the corresponding brightness data of each pixel X bit binary datas in high Y in, the map unit 320 also by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in every adjacent N number of pixel the corresponding brightness data of each pixel X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X.In one example, X is more than or equal to 8, such as equal to 8 or 10, Y are bigger, and the reliability that data receiver recovers described high Y is higher, and Y value can be set as needed, and Y is typically larger than equal to 2, such as 3-5.The default X-Y bit binary datas can all be 0 or 1 or other pre-set X-Y bit binary datas.
So, the map unit 320 can be obtained by the corresponding X brightness data of each pixel having been loaded with the horizontal scanning line for synthesizing composite video signal of digital code stream.Simultaneously, the map unit 320 can also generate for synthesize composite video signal horizontal scanning line in the corresponding chroma data of each pixel, now due to not loading digital code stream in chroma data, therefore these chroma datas can all be 1 or 0 or other pre-set binary sequences.
Certainly, in another embodiment, the digital code stream that digital data source 310 can also be provided is mapped in chroma data using identical mode above, now, the map unit 320 can also generate for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel, now due to not loading digital code stream in brightness data, therefore these brightness datas can all be 1 or 0 or other pre-set binary sequences.
The composite video signal coding unit 330 is used to generate synchronizing signal, receive the chroma data and brightness data that are used to synthesize composite video signal that have been loaded with digital code stream from map unit 320, and chroma data and brightness data generation analog composite video signal according to predetermined composite video standard based on synchronizing signal, for synthesizing composite video signal.The predetermined composite video standard can for NTSC (National Television Standards Committee) standards or
PAL (Phase Alternating Line) standard.The composite video signal coding unit 330 can be traditional composite video signal coding techniques, no longer be described in detail herein.
The composite video coffret 340 can be using the TV-out interfaces as common D1/960H simulation monitorings camera.The composite video coffret 340 can be with connecting coaxial cable, and transmits the analog composite video signal by coaxial cable.Certainly, composite video coffret 340 can also connect the cable of other existing standards to transmit the analog composite video signal.
It can be seen that, the digital code stream that the present invention provides digital data source 210 is mapped in brightness data or chroma data for synthesizing composite video signal, and composite video signal is formd based on the brightness data or chroma data that are used to synthesize composite video signal for being loaded with digital code stream, the digital code stream of the offer of digital data source 210 can be so provided using transmission lines such as original coaxial cables.In addition, digital code stream " camouflage " will be mapped in composite video signal by the obvious present invention into brightness data or chroma data, composite video signal CVBS transmission characteristic is not changed, no matter the digital code stream of mapping is any data, for coaxial cable, what it was transmitted is all the CVBS signals of standard, therefore can realize the transmission of digital code stream long range on the coaxial cable of existing normal quality.This technical characterstic has very great significance for field of video monitoring tool, can be with high efficiency, at low cost on the premise of the delivering path and method of traditional analog SD is not changed, utilize the coaxial cable of original normal quality, such as international standard RG-59, Chinese Industrial Standards (CIS) is the coaxial cables such as 75-3, so that it may easily realize more than 300 meters high-definition video signal transmission.
With X=8, Y=4, N=9, composite video signal is introduced under pal mode (575 scan lines, 25 frame per second) with example.X=8 means that the brightness data of each pixel of horizontal scanning line is 8bit binary data, and Y=4 means one group of 4bit data in digital code stream being mapped in high 4 in the 8bit binary data of the brightness data of the pixel of horizontal scanning line.N=9 means every 9 pixels using one group of 4bit data mapping.For example, when having 720 pixel per horizontal scanning line, can be to be mapped into the 4bit data of digital code stream in high 4 of the brightness data in every 9 pixels, so often 720 pixels of horizontal scanning line will be loaded with 80 group of 4 digital bit code stream.
With reference to Fig. 4, it is used as a kind of preferred embodiment, Fig. 4 provides a kind of data sink 400, and it can receive the composite video signal sent from data sending device 300, and therefrom acquire the digital code stream being loaded into data sending device 300 in the composite video signal.The data sink 400 includes composite video coffret 410, composite video signal decoding unit 420 and data extracting unit 430.
The composite video coffret 410 is used to receive analog composite video signal.The interface 410 can be using the TV-out interfaces as common simulation monitoring camera.The TV-out interfaces can be connected with coaxial cable, to receive the analog composite video signal transmitted by coaxial cable.
The composite video signal decoding unit 420 is used to carry out decoding process to obtain video data by analog composite video signal according to predetermined composite video standard requirement.The predetermined composite video standard equally can be NTSC (National Television Standards Committee) standards or PAL (Phase Alternating Line) standard.Which kind of the composite video standard used in data sending device, then be also accomplished by which kind of composite video standard used in data sink.Specifically, the composite video signal decoding unit 420 can obtain the corresponding brightness data of pixel and chroma data in synchronizing signal, horizontal scanning line with decoded analog composite video signal.The composite video signal decoding unit 420 can be traditional composite video signal decoding technique, no longer be described in detail herein.
The digital code stream being mapped in brightness data or chroma data is extracted in the corresponding brightness data of pixel or chroma data in the horizontal scanning line that data extracting unit 430 is obtained from decoding, wherein brightness data and chroma data can be collectively referred to as video data.The digital code stream extracted is the one or more in vision signal, audio signal, control signal, monitoring alarm signal.
Here it is introduced exemplified by the digital code stream being mapped in brightness data is extracted in the corresponding brightness data of pixel in the horizontal scanning line obtained from decoding.The digital code stream principle that the digital code stream principle that extraction is mapped in chroma data from chroma data is mapped in brightness data with being extracted from brightness data is identical, and this text is not repeated to describe.It is preferred that, the data extracting unit 430 is that one group of data of the digital code stream are extracted from the corresponding brightness data of every adjacent N number of pixel in horizontal scanning line.
In a specific embodiment, the corresponding brightness data of each pixel in the horizontal scanning line is X bit binary datas, and the data extracting unit 430 is that one group of common Y data of the digital code stream are extracted from high Y in the X bit binary datas of the corresponding brightness data of every adjacent N number of pixel in the horizontal scanning line.For low X-Y of brightness data, as mapped in data sending terminal using default X-Y bit binary datas, then the data extracting unit 430 can carry out discard processing to it.Further, since chroma data is not loaded with the data of digital code stream, therefore it can also be simply discarded in data sink 400.
In one embodiment, the data sink 400 also includes video decompression unit, it is according to predetermined decompression standard, such as H.264, MPEG2, H.265 etc., the obtained digital code stream is extracted to data extracting unit 430 to decompress, with the digital video signal after being decompressed.The digital video signal can be the signal of high-definition format, so in number
According to can just realize the recovery of high-definition digital video signal in reception device 400.
As can be seen that the digital code stream that can effectively will be mapped in the composite video signal in data sink 400 is restored, and then realize transmission of the digital code stream based on composite video signal.
Data sending device 300 and data sink 400 in the present invention is two relative equipment, one can be referred to as data sending terminal, another can be referred to as data receiver, they may be collectively referred to as a data transmission system, and transmission of the digital code stream based on composite video signal is realized with common.
Data transmission scheme in the present invention is also implemented as a kind of method.
Fig. 5 is data transmission method for uplink 500 of the present invention in a kind of method flow diagram of preferred embodiment.As shown in Figure 5, the data transmission method for uplink 500 comprises the following steps.
Step 510 can provide digital code stream there is provided digital data source 510, the digital data source.The digital code stream that the digital data source is provided is the one or more in vision signal, audio signal, control signal, monitoring alarm signal.
It is preferred that, the offer digital data source 510 includes：The digital video source data of the captured picture of collection；By the digital video source data according to such as H.263, MPEG2, H.265 etc. video compression standard be compressed and obtain compression of digital video data, the compression of digital video data can be used as the digital code stream of digital data source offer.It is more highly preferred to, the digital video source can be high-definition format, and the high-definition format refers to the resolution ratio of 720p and the above, such as 720p, 1080i, 1080p etc., such data transmission method for uplink 500 can just support the collection and transmission of high-definition digital video data.
Step 520, the digital code stream that digital data source is provided is mapped in brightness data or chroma data for synthesizing composite video signal, wherein the brightness data and chroma data can be said to video data.
Hereafter by every group of data in the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal brightness data in exemplified by be introduced, what the those of ordinary skill in art was able to know that is, every group of data in the digital code stream that the digital data source is provided be mapped to the principle of the chroma data for synthesizing composite video signal be mapped to every group of data in the digital code stream for providing the digital data source brightness data for synthesizing composite video signal principle it is identical, be not repeated herein.
Specifically, in step 520, be every group of data in the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel in, wherein N is the integer more than or equal to 1.
The corresponding brightness data of each pixel in horizontal scanning line for synthesizing composite video signal is X bit binary datas.
In more specifically embodiment, in step 520, be every group of common Y bit binary data in the digital code stream that digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in every adjacent N number of pixel the corresponding brightness data of each pixel X bit binary datas in high Y in, by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel X bit binary datas in low X-Y in.
In addition, when the digital code stream for providing the digital data source is mapped to for synthesizing in the brightness data of composite video signal, in step 520, generating for synthesizing the chroma data in composite video signal and generation synchronizing signal.
Step 530, it is compounded to form analog composite video signal according to predetermined composite video standard by synchronizing signal and for the chroma data and brightness data for synthesizing composite video signal.The predetermined composite video standard can be TSC-system formula, pal mode or other standards.
Step 540, the analog composite video signal is transmitted by coaxial cable.
In this embodiment, X, Y, N value may be referred to the value in above data sending device 300, remaining some details, can also be with reference to the associated description in above data sending device 300.
Fig. 6 is data receiver method 600 of the present invention in a kind of method flow diagram of preferred embodiment.The data receiver method 600, it can receive the composite video signal sent according to data transmission method for uplink 500, and therefrom acquire the digital code stream being loaded into data transmission method for uplink 400 in the composite video signal, and it comprises the following steps.
Step 610, analog composite video signal is received by coaxial cable.
Step 620, analog composite video signal is carried out decoding process to obtain video data according to predetermined composite video standard requirement.The predetermined composite video standard equally can be TSC-system formula or pal mode.
Specifically, in step 620, analog composite video signal can be decoded to obtain the corresponding brightness data of pixel and the chroma data in synchronizing signal, horizontal scanning line.The composite video signal decoding unit 420 can be traditional composite video signal decoding technique, no longer be described in detail herein.
Step 630, the digital code stream being mapped in the video data is extracted from the video data.Wherein, it is the one or more in vision signal, audio signal, control signal, monitoring alarm signal in the digital code stream extracted..
It is one group of data that the digital code stream is extracted in the corresponding brightness data of every adjacent N number of pixel or the chroma data in the horizontal scanning line that self-demarking code is obtained specifically, in act 630.
If in data sending terminal, the digital code stream is mapped in brightness data, then the numeral is extracted from brightness data
Code stream, if in data receiver, the digital code stream is mapped in chroma data, then the digital code stream is extracted from chroma data.Hereinafter it is introduced so that the digital code stream is mapped in brightness data as an example.
It is X bit binary datas to decode the corresponding brightness data of each pixel in the horizontal scanning line obtained.More specifically, in act 630, one group of common Y data of digital code stream are extracted in high Y in the X bit binary datas of the corresponding brightness data of every adjacent N number of pixel in the horizontal scanning line that self-demarking code is obtained.Furthermore, it is possible to directly by low X-Y discardings in the X bit binary datas for decoding the corresponding brightness data of every adjacent N number of pixel in obtained horizontal scanning line, while decoding can also be obtained into the corresponding chroma data discarding of pixel in horizontal scanning line.
In a preferred embodiment, the data receiver method also includes：H.264, MPEG2, H.265 etc. according to predetermined decompression standard, such as, the digital code stream that extraction is obtained is decompressed, with the digital video signal after being decompressed.The digital video signal can be the signal of high-definition format, and the recovery of high-definition digital video signal so can be just realized in data receiver method 600.
Data transmission method for uplink 500 and data method of reseptance 600 in the present invention is corresponding, the composite video signal that methods described 500 is sent can be received and decoded by methods described 600, they may be collectively referred to as a data transmission method, and transmission of the digital code stream based on composite video signal is realized with common.
In this embodiment, X, Y, N value may be referred to the value in above data sink 400, remaining some details, can also be with reference to the associated description in above data sink 400.
In an application scenarios, the data sending device 300 is exactly the HD video camera of video monitoring system, the data sink 300 is exactly the video reception apparatus in video monitoring system, HD video camera and video reception apparatus are connected by TV-out interfaces with common coaxial cable, connected mode is instant inserted and instant using type, and traditional analog video can be supported to monitor the analog signal transmission of used NTSC/PAL/960H standards.Therefore in this application scene, coaxial cable can be using the cable laid in the video monitoring system of user's low resolution, without laying again.In other words, the present invention can realize the transmission of high-definition digital video data using the existing coaxial cable laid, it is achieved thereby that compatible with existing system framework.
Obviously, this data transmission system proposed in the present invention can transmit the analog video of the standard resolution under NTSC/PAL/960H standards as before.In addition, the HD video similar to 720p and 1080p can also be transmitted simultaneously.In one embodiment, the video acquisition unit of the HD video camera is after the HD video source data of the captured picture of collection, its video compressing unit is by the HD video source data according to compression standard, such as H.264 standard is compressed and obtains numeral
HD video compressed data.The digital high-definition video compression data is mapped in the video data for synthesizing composite video signal by its map unit.As a kind of more excellent scheme, in the brightness data that may map to video data.Its composite video signal coding unit receives the video data after the mapping from map unit, and according to predetermined composite video standard, such as pal mode requires to produce analog composite video signal, and is exported by TV-out interfaces.
Analog composite video signal is transmitted although with NTSC/PAL standards, but the digital high-definition video compression data being wherein embedded into can be reconditioned：Analog video data is regarded as to the analog waveform (analog waveforms of modulated digital symbols) for the numerical chracter modulated, such as pulse-amplitude modulation in certain bit number Y.Such as pal mode, it sends the effective horizontal scanning line of 575 rows with the frame frequency of 25 frame per second.Every horizontal scanning line is an analog waveform, and it can be considered as pulse amplitude modulation (PAM) waveform of a consecutive variations.By this analog waveform, a series of data signal (PCM, pulse code modulation) can be reconditioned.As another embodiment, quadrature amplitude modulation (QAM modulation), such as QAM16, QAM 64, QAM128, QAM256 etc. can be used in the present invention.
To restore digital high-definition video compression data, the present invention video reception apparatus by TV-out interfaces to transmission over coaxial cable come analog composite video signal after, first according to predetermined composite video standard requirement, analog composite video signal is carried out decoding process to obtain video data；Data extracting unit will extract digital high-definition video compression data from the video data；As a kind of more excellent scheme, data extracting unit is the extraction digital high-definition video compression data out of brightness data in video data.Digital HD video compressed data is decompressed according to predetermined decompression standard again afterwards, so that the high-definition digital video signal after being decompressed.Thus achieve purpose of the digital video signal by conventional composite transmission of video channel transfer.
, in one embodiment, can be using the method for reducing symbol rate (symbol rate) accurately to restore PCM data signals from analog waveform.Symbol rate is reduced at double, can help to improve the accuracy that sampling point recovers.Reducing the method for symbol rate is, for the pixel of every horizontal scanning line under a predetermined composite video standard, at video signal collective end, one group of Ybit data in digital high-definition video compression data are mapped in the brightness data corresponding to each pixel per adjacent N number of pixel by map unit, at video reception end, to the every N number of pixel point sampling of brightness data once, N can generally be divided exactly data extracting unit by the sum of all pixels of every horizontal scanning line.As a kind of more excellent scheme, N can be more than or equal to 4, such as be 9, now when a horizontal scanning line has 720 pixel, the data compressed can be mapped in brightness data with every 9 pixels, therefore can restore about 80 sampling points of horizontal scanning line.
Further, in order to better meet the bandwidth requirements of NTSC/PAL standards, for 8bit brightness data, at video signal collective end, map unit digital high-definition video compression data can be mapped to brightness data high 3bit or high 4bit or
High 5bit, also maps to most 8bit certainly.Correspondingly at video reception end, the sampling point that data extracting unit is obtained to sampling extracts its high 3bit or high 4bit or high 5bit data as digital high-definition video compression data.Under pal mode, high 4bit is such as taken, every 9 pixel point samplings are once, in every 720 pixel of horizontal scanning line, transmission data rate is 575*25*4*720/9=4.6Mbit/s, and in every 960 pixel of horizontal scanning line, transmission data rate is 575*25*4*960/9=6.1Mbit/s.Bandwidth limitation in visible video monitoring system under NTSC/PAL standards can support the transmission of the high-definition digital video data of the present invention completely.
The high definition camera device of the present invention and the structure of video signal receiving apparatus are very approximate with the structure of Network Video Surveillance camera and DVR, NVR in the prior art, therefore, one of ordinary skilled in the art is based on content disclosed in this invention, new device and equipment can be developed, or increases new software or hardware feature module on the basis of existing apparatus and equipment and realizes the present invention.This improvement should be all within protection scope of the present invention.
For example, directly using existing IP Camera and DVR boxes.Only need to software or hardware module that the high-definition digital compressed video data after network shooting head end increases by one for IP Camera to be compressed is mapped in composite video.Equally, accordingly increase such module in DVR boxes, for extracting the high-definition digital compressed video data compressed from the video data of " looking like uncompressed ", and store and decompress.This system can compatibility standard resolution ratio simultaneously simulation camera and high-resolution camera, and cost is very low.
For another example replacing foregoing DVR using a NVR.Increase a composite video decoder into NVR, the composite video decoder is a chip that NTSC/PAL stream compressions are changed into data signal.So, NVR is used with regard to that can be as traditional DVR.Because NVR need not perform any squeeze operation, and NVR chip is generally more cheap than DVR.
It can be seen that, the present invention can directly utilize standard composite video decoding chip.In other words, high-resolution can also be directly used in the invention enables the DVR boxes of standard resolution.
In summary, the device of video data transmission provided by the present invention, device and method advantage it is as follows：
The present invention can meet following cited all demands；
1st, high-resolution camera (such as 720P, 1080P or higher) is supported.
2nd, the coaxial cable based on existing normal quality, such as international standard are RG-59, and Chinese Industrial Standards (CIS) is 75-3 coaxial cable, is transmitted over long distances, such as more than 300 meters or farther, and centre need not increase repeater.
3rd, easily install-do not need network management and net administrator.
4th, back compatible CCTV cameras.
5th, cost is reasonable.
And it is very low present invention is implemented as this, with backward compatible ability, it can be directly applied in many existing NTSC/PAL systems；
For each camera only needs to the application environment of the video flowing of transmission its own all the way in video monitoring, the present invention has enough bandwidth, it is possible to achieve 4~6Mbps, at least 1080p transmission of video.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, within the spirit and principles of the invention, any modification, equivalent substitution for being made etc., should be included in the scope of the protection.
Claims (33)
- A kind of data sending device, it includes：Map unit, the digital code stream for digital data source to be provided is mapped in the video data for synthesizing composite video signal；Composite video signal coding unit, receives the video data for synthesizing composite video signal from map unit, and require generation analog composite video signal according to predetermined composite video standard；Composite video coffret, for transmitting the analog composite video signal.
- Device as claimed in claim 1, it is characterised in that：The map unit is that the digital code stream for providing digital data source is mapped in brightness data or the chroma data for being used to synthesize in the video data of composite video signal.
- Device as claimed in claim 2, it is characterised in that：The map unit be every group of data in the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
- Device as claimed in claim 3, it is characterised in that：The corresponding brightness data of each pixel or chroma data in horizontal scanning line for synthesizing composite video signal are X bit binary datas,The map unit be every group of common Y bit binary data in the digital code stream that digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel of every adjacent N number of pixel or the X bit binary datas of chroma data in high Y in, the map unit also by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X is more than or equal to 8, Y is more than or equal to 2.
- Device as claimed in claim 2, it is characterised in that：During brightness data in the video data that the digital code stream that the digital data source is provided is mapped to for synthesizing composite video signal by the map unit, the map unit is also generated for synthesizing the chroma data in the video data in composite video signal, or, the map unit by the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal video data in chroma data in when, the map unit is also generated for synthesizing the brightness data in the video data in composite video signalComposite video signal coding unit, for generating synchronizing signal, and according to predetermined composite video standard by synchronizing signal and chroma data and brightness data from map unit are compounded to form analog composite video signal,Composite video coffret connecting coaxial cable is to transmit the analog composite video signal.
- Device as claimed in claim 1, it is characterised in that：The digital code stream that digital data source is provided is the one or more in vision signal, audio signal, control signal, monitoring alarm signal.
- A kind of camera device, it is characterised in that：It includes：Video acquisition unit, the digital video source data for gathering captured picture；Video compressing unit, compression of digital video data are obtained for the digital video source data to be compressed；Map unit, for the compression of digital video data to be mapped in the video data for synthesizing composite video signal；Composite video signal coding unit, receives the video data for synthesizing composite video signal from map unit, and require generation analog composite video signal according to predetermined composite video standard；Composite video coffret, the analog composite video signal is transmitted for connecting coaxial cable, and by the coaxial cable.
- Device as claimed in claim 7, it is characterised in that：The digital video source data of the video acquisition unit collection is high-definition format,The compression of digital video data that the video compressing unit is obtained are also high-definition digital video compressed data,The map unit be by every group of data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
- Device as claimed in claim 8, it is characterised in that：The corresponding brightness data of each pixel or chroma data in horizontal scanning line for synthesizing composite video signal are X bit binary datas,The map unit be by every group of common Y bit binary data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel of every adjacent N number of pixel or the X bit binary datas of chroma data in high Y in, the mapping is single Member also by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X is more than or equal to 8, Y is more than or equal to 2During the corresponding brightness data of pixel in the horizontal scanning line that the high-definition digital video compressed data is mapped to for synthesizing composite video signal by the map unit, the map unit is also generated for synthesizing the corresponding chroma data of the pixel in composite video signal, or, during the corresponding chroma data of pixel in the horizontal scanning line that the high-definition digital video compressed data is mapped to for synthesizing composite video signal by the map unit, the map unit is also generated for synthesizing the corresponding chroma data of the pixel in composite video signalComposite video signal coding unit is additionally operable to generate synchronizing signal, and according to predetermined composite video standard by synchronizing signal and chroma data and brightness data from map unit are compounded to form analog composite video signal.
- A kind of data sink, it includes：Composite video coffret, for receiving analog composite video signal；Composite video signal decoding unit is used to, according to predetermined composite video standard requirement, analog composite video signal be carried out decoding process to obtain video data；Data extracting unit, for extracting the digital code stream being mapped in video data from the video data.
- Device as claimed in claim 10, it is characterised in that：Composite video signal decoding unit is used to analog composite video signal is carried out into decoding process to obtain the corresponding brightness data of pixel and the chroma data in synchronizing signal, horizontal scanning line according to predetermined composite video standard requirement, and data extracting unit is that the digital code stream being mapped in brightness data or chroma data is extracted from the corresponding brightness data of pixel or chroma data in horizontal scanning line.
- Device as claimed in claim 11, it is characterised in that：The data extracting unit is that one group of data of digital code stream are extracted from the corresponding brightness data of every adjacent N number of pixel or chroma data in horizontal scanning line, and wherein N is the integer more than or equal to 1.
- Device as claimed in claim 12, it is characterised in that：The corresponding brightness data of each pixel or chroma data in the horizontal scanning line are X bit binary datas,The data extracting unit is that one group of common Y data of digital code stream are extracted from high Y in the corresponding brightness data of every adjacent N number of pixel or the X bit binary datas of chroma data in the horizontal scanning line,Wherein X and Y is positive integer and Y is less than X, and the N is more than or equal to 4, X and is more than or equal to 8, Y more than or equal to 2.
- Device as claimed in claim 10, it is characterised in that：It is the one or more in vision signal, audio signal, control signal, monitoring alarm signal in the digital code stream extracted.
- A kind of video signal receiving apparatus, it is characterised in that：It includes：Composite video coffret, for receiving analog composite video signal by coaxial cable；Composite video signal decoding unit is used to, according to predetermined composite video standard requirement, analog composite video signal be carried out decoding process to obtain video data；Data extracting unit, for extracting the digital code stream being mapped in video data from the video data；Video decompression unit, for being decompressed to the digital code stream, with the digital video signal after being decompressed.
- Equipment as claimed in claim 15, it is characterised in that：Composite video signal decoding unit is used to carry out decoding process to obtain the corresponding brightness data of pixel and the chroma data in synchronizing signal, horizontal scanning line by analog composite video signal according to predetermined composite video standard requirement, data extracting unit is that the digital code stream being mapped in video data is extracted from the corresponding brightness data of pixel or chroma data in horizontal scanning line, and the digital video signal is high-definition format.
- Equipment as claimed in claim 16, it is characterised in that：The corresponding brightness data of each pixel or chroma data in the horizontal scanning line are X bit binary datas, the data extracting unit is that one group of common Y data of digital code stream are extracted from high Y in the corresponding brightness data of every adjacent N number of pixel or the X bit binary datas of chroma data in the horizontal scanning lineWherein X and Y is positive integer and Y is less than X, and the N is more than or equal to 4, X and is more than or equal to 8, Y more than or equal to 2.
- A kind of data transmission method for uplink, it includes：The digital code stream that digital data source is provided is mapped in the video data for synthesizing composite video signal；Analog composite video signal is produced based on the video data for synthesizing composite video signal according to predetermined composite video standard requirement；WithTransmit the analog composite video signal.
- Method as claimed in claim 18, it is characterised in that：The digital code stream that digital data source is provided be mapped to for synthesize composite video signal video data in be：The digital code stream that digital data source is provided is mapped in brightness data or the chroma data for being used to synthesize in the video data of composite video signal.
- Method as claimed in claim 19, it is characterised in that：The digital code stream that digital data source is provided is mapped in brightness data or the chroma data for being used to synthesize in the video data of composite video signal：Every group of data in the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
- Method as claimed in claim 20, it is characterised in that：The corresponding brightness data of each pixel or chroma data in horizontal scanning line for synthesizing composite video signal are X bit binary datas,Every group of data in the digital code stream that the digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in be：Every group of common Y bit binary data in the digital code stream that digital data source is provided be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel of every adjacent N number of pixel or the X bit binary datas of chroma data in high Y in, by default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X is more than or equal to 8, Y is more than or equal to 2.
- Method as claimed in claim 19, it is characterised in that：When the digital code stream for providing the digital data source is mapped to the brightness data for synthesizing composite video signal, methods described also includes：Generate for synthesizing the chroma data in composite video signal and generation synchronizing signal；Or when the digital code stream for providing the digital data source is mapped to for synthesizing in the chroma data of composite video signal, methods described also includes：Generate for synthesizing the brightness data in composite video signal and generation synchronizing signal,It is based on the video data generation analog composite video signal for synthesizing composite video signal according to predetermined composite video standard requirement：It is by synchronizing signal and compound for synthesizing according to predetermined composite video standard The chroma data and brightness data of vision signal are compounded to form analog composite video signal,The analog composite video signal is transmitted by coaxial cable.
- Method as claimed in claim 18, it is characterised in that：The digital code stream that digital data source is provided is the one or more in vision signal, audio signal, control signal, monitoring alarm signal.
- A kind of data transmission method for uplink, it is characterised in that：It includes：The digital video source data of the captured picture of collection；The digital video source data is compressed and compression of digital video data are obtained；The compression of digital video data are mapped in the video data for synthesizing composite video signal；Video data based on synthesis composite video signal requires to produce analog composite video signal according to predetermined composite video standard；The analog composite video signal is transmitted by coaxial cable.
- Method as claimed in claim 24, it is characterised in that：The digital video source data of collection is high-definition format,The compression of digital video data of acquisition are also high-definition digital video compressed data,By the compression of digital video data be mapped to for synthesize composite video signal video data in be：By every group of data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in, wherein N is the integer more than or equal to 1.
- Method as claimed in claim 25, it is characterised in that：The corresponding brightness data of each pixel or chroma data in horizontal scanning line for synthesizing composite video signal are X bit binary datas,By every group of data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data in be：By every group of common Y bit binary data in the high-definition digital video compressed data be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of each pixel of every adjacent N number of pixel or the X bit binary datas of chroma data in high Y in；By default X-Y bit binary datas be mapped to for synthesize composite video signal horizontal scanning line in the corresponding brightness data of every adjacent N number of pixel or chroma data X bit binary datas in low X-Y in, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X is more than or equal to 8, Y More than or equal to 2,During the corresponding brightness data of pixel in the horizontal scanning line that the high-definition digital video compressed data is mapped to for synthesizing composite video signal, methods described also includes：Generate for synthesize the corresponding chroma data of the pixel in composite video signal and generation synchronizing signal, or,During the corresponding chroma data of pixel in the horizontal scanning line that the high-definition digital video compressed data is mapped to for synthesizing composite video signal, methods described also includes：Generate for synthesizing the corresponding chroma data of the pixel in composite video signal and generation synchronizing signal,The video data for synthesizing composite video signal is received, and requires that producing analog composite video signal is according to predetermined composite video standard：Video data based on synthesis composite video signal requires that producing analog composite video signal is according to predetermined composite video standard：Analog composite video signal is compounded to form by synchronizing signal and for the chroma data and brightness data for synthesizing composite video signal according to predetermined composite video standard.
- A kind of data receiver method, it includes：Receive analog composite video signal；Analog composite video signal is carried out decoding process to obtain video data according to predetermined composite video standard requirement；The digital code stream being mapped in the video data is extracted from the video data.
- Method as claimed in claim 27, it is characterised in that：The video data includes the corresponding brightness data of pixel and chroma data in horizontal scanning line；The digital code stream being mapped in the video data is extracted from the video data is：One group of data of digital code stream are extracted from the corresponding brightness data of every adjacent N number of pixel or chroma data in horizontal scanning line, wherein N is the integer more than or equal to 1.
- Method as claimed in claim 28, it is characterised in that：The corresponding brightness data of each pixel or chroma data in the horizontal scanning line are X bit binary datas,One group of data of digital code stream are extracted from the corresponding brightness data of every adjacent N number of pixel or chroma data in horizontal scanning line is：One group of common Y data of digital code stream are extracted from high Y in the corresponding brightness data of every adjacent N number of pixel or the X bit binary datas of chroma data in the horizontal scanning line, wherein X and Y is positive integer and Y is less than X, the N is more than or equal to 4, X and is more than or equal to 8, Y more than or equal to 2.
- Method as claimed in claim 27, it is characterised in that：Received by coaxial cable in analog composite video signal, the digital code stream extracted as the one or more in vision signal, audio signal, control signal, monitoring alarm signal.
- A kind of data receiver method, it is characterised in that：It includes：Analog composite video signal is received by coaxial cable；Analog composite video signal is carried out decoding process to obtain video data according to predetermined composite video standard requirement；The digital code stream being mapped in video data is extracted from the video data；The digital code stream is decompressed, with the digital video signal after being decompressed.
- Method as claimed in claim 31, it is characterised in that：Analog composite video signal is carried out to obtain the corresponding brightness data of pixel and the chroma data in synchronizing signal, horizontal scanning line by decoding process according to predetermined composite video standard requirement,The digital code stream being mapped in video data is extracted from the video data is：One group of data of the digital code stream being mapped in video data are extracted from the corresponding brightness data of pixel or chroma data in horizontal scanning line, the digital video signal is high-definition format.
- Method as claimed in claim 32, it is characterised in that：The corresponding brightness data of each pixel or chroma data in the horizontal scanning line are X bit binary datas,One group of data of the digital code stream being mapped in video data are extracted from the corresponding brightness data of pixel or chroma data in horizontal scanning line is：One group of common Y data of digital code stream are extracted from high Y in the corresponding brightness data of every adjacent N number of pixel or the X bit binary datas of chroma data in the horizontal scanning line,Wherein X and Y is positive integer and Y is less than X, and the N is more than or equal to 4, X and is more than or equal to 8, Y more than or equal to 2.
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| US20170180677A1 (en) | 2017-06-22 |
| CN105611227A (en) | 2016-05-25 |
| US11233971B2 (en) | 2022-01-25 |
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| CN105611228B (en) | 2019-04-12 |
| CN105611227B (en) | 2019-07-19 |
| CN111031277A (en) | 2020-04-17 |
| CN111031277B (en) | 2022-02-22 |
| CN105611228A (en) | 2016-05-25 |
| CN105874784B (en) | 2019-09-24 |
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| CN105611229B (en) | 2019-08-23 |
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